Automatic switch



May 1, 1928.

E. E. .CODDINGTON AUTOMATIC SWITCH Filed Sept 20. 1926 2 Sheets-$heet 1fan, nvcntoo May 1, 1928.

E. E. CODDINGTON AUTOMATI C SWITCH Filed Sept. 20. 1926 2 Sheets-Sheet 2the 50044;

fan gl vemtoc Patented May 1, 1928.

PATENT OFFICE.

UNITED STATES nurse 1:; conmNG'roN, or LA roars, INDIANA.

AUTOMATIC SWITCH.

Application filed September 20, 1926. Serial No. 136,664;

having connection with the draft and switch with novel meansconnectingthe throw lever with the thermostat rod. 6

provision of a novel toggle lever connection with the throw arm or leverand novel means carried by' the lever for operating the switch.

A further object of the inventionis the provision of novel means formounting the switch, whereby breakage of the switch and the throw arm orlever is eliminated. i a

A further object of the inventionis the provision of novel means forforming the the draft and switch operating member is permitted.

A still further object of theinvention is to provide a noveldraftcontrolling device and circuit closing lever for thefan there forof the above character, which will be durable and eflicientin use, onethat will be simple andeasy to manufacture and one which can be placedupon the market and incorporated with a 'conventional furnace 6structure at a small cost. a

\Vith these and other objects in view, the invention consists in thenovel construction, arrangement and formation of parts, as will behereinafter more specifically described, claimed, and illustrated in theaccompanying drawings, in which drawings:

Figure 1 is a side elevation of the improved device showing the same inits inoperative position, 1 a

Figure 2 is an end elevation of the same, Figure 3 is an enlargedfragmentary section illustrating the means employed for supporting theswitch for eliminating the breakage of the parts of the device,

Figure {l is a fragmflntfiryplan view of draft from a single thermostat,the device embodying a throw lever A further object of the invention islthe throw arm or lever whereby adjustment of.

theforward end of the throw arm or lever, showing one type thereof,

Figure 5 's a view slmilar to Figure 1 6 showing the device in itsoperative position with the switch closed and the throw arm or lever inits arranged position for opening the draft.

Figure 6 is a longitudinal section through a modified form of throw armor lever in which adjustment is provided for the draft oplelning chainand the switch operating ro err Figure 7 is an enlarged fragmentary sideelevation of the forward end of'a still further modified device of thethrow arm or lever showing a bridge member for the switch of the hooktype, and

Figure 8 is a fragmentary side elevation ofra still further modifiedform of the throw arm or lever showing a bridge piece for the contact ofthe switch of the drag or leaf spring type. 6

-Figure 9 is a view similar to Figure 1 showing the device associatedwith a furnace, a r

6 Referring to the drawings in detail,

wherein similarreference characters designate corresponding partsthroughout the several views the letter A generally indicates theimproved device which comprises an operating .or throw arm or lever 10.which is pivotally mounted at its inner end in suitable brackets 11.This bracket 11 can be connected to the furnace structure or mountedabove the furnace structure at any desired point. The forward endof thisl'ever supports a yoke 12 carrying a rotatable switch throw roller 13.This roller preferably consists of a solid wooden hubl i with an outermetal sleeve 15.

Arranged belowt-he throw or operating lover or arm 10 is thethermostatrod16 which leads out of the furnace from the thermostat inthe ordinary way. A. toggle lever 17 has its outer end pivotally connected respectively to the throw arm or lever 10, and to a bracket 19 as at20. This bracket 19 can be secured directly to the furnace structure.The/toggle lever includes the'usual links which have their inner endspivotally connected together. The thermostat rod has its outer endprovided with a yoke 21 which is pivotally connected as at 22 to thelowermost linkof the toggle lever 17 adjacent to the pivot point 20 andit is obvious that upon inward and outward movement of the thermostatrod 16-that the ble chain 23 which is connectedto the fur nace draftdoor.

As stated the roller 13 is utilized for closing a switch, and thisswitch is generally indicated by the reference character 24 and is ofthe throw lever type. The switch embodies a base plate 25 to which ispivotally connected the foot lever 26, the forward end of'which isadapted to engage a contact post 27. The lever is pivotally mountedintermediate its ends, and the lower end of the lever at a point remotefrom the end which engages the post 27 is provided with a rubber head 28and a contractile coil spring 29 is connected to said head and normallytends to hold the lever 26 from out of engagement with said post. Thefree end of the lever is arranged in the path of the roller 13 and thusupon actuation of the toggle 1'7 and the raising of the throw arm orlever the foot lever 26 will be moved into contact with the the tensionof the spring 29.

In order to prevent breakage of the switch 'and the throw arm orlever-l0, the switch is mounted in a novel manner and as shown the baseof the switch secured by suitable fastening elements to a depending arm30 which is pivotally connected at its upper end to a supporting block31, as at 32. This bloelcis suitably connected to a ceiling joist 33 orthe like. The arm 30 is adapted to normally abut a stop blocl' 34; alsosecured to the ceiling joist and this block extends below the block 31and engages the inner face of the arm 30.,

In order to normally hold the arm 30 in engagement with the block aU-shaped strap 35 is secured to the arm which straddles the block 34 anda flexible cable 36 is connected to said strap and is trained over apulley 37 carried by the depending bracket 38 secured to the joist. Aweight 39 is connected to the free end of the cable and thus the weightnormally tends to move the arm in engagement with said block 34,ashoretobefore stated.

In order to insure the ing of the block and the arm a contractile coilspring 10 is also provided and this coil spring engages the outer faceof the arm 30 and a U-shaped saddle strap 4]. which has its terminalsconnect-ed to the block 34.

In operation of the improved device, when the furnace cools, the rodwill be drawn inwardly and will pull in on the toggle 17 and thus raisethe throw lever 10. The upward movement of the throw lever 10 will moveproper positionthe roller 13 in contact with the free end of the footlever 26 and rock the same on its pivot and. move the foot lever inconposts 27 against vouter end provided with tact with the posts 27.This will close the circuit to the fan and as the lever 10 rises a pullwill be exerted on the chain 23 which will open the draft of thefurnace. Due to the swinging are of the arm or lever it is necessarythat a certain give between the throw arm or lever 10 and the switch bepermitted and the arm 30 allows for this movement and the lever willswing the arm Eltloutward against the tension of the spring 4:0 and theaction of the weight 39. The spring at all times.

In Figure 6 I have shown a slightly modified form of the throw arm orlever 10 in which means is provided for permittingthe adjustment of theroller 13 toward and away from the arm and adjustment of the chain 23longitudinally of said arm. To carry out this feature, the arm 10adjacent the forward end thereof is slotted, as at 42, and bolts 43utilized for connecting the brackets 12 to the arm extend through theslots. It is obvious that by loosening the bolts, the bracket can heslid inward or outward as desired. In this form the chain 23 is rovidedwith a clevis 44 having a bolt 45 w ich extends through a slot 46 in thearm or lever. By loosening the bolt the clevis can he slidlongitudinally of the lever to allow initial adjustment of the same. 7

\Vhile I prefer to utilize'a roller 13 for operating the switch, it isto be understood that the arm or lever 10 can be utilized directly forclosing the circuit.v In Figures 7 and 8 I have shown means foraccomplishing this. In Figure .7 the arm 10 has its a. hoop shapedbridge piece 50 made of suitable conducting material which is adapted toengage spaced contacts 51 and 52 when the arm is raised. The contactscan be carried by the depending arm 30 as shown in Figures land 5. j

, In Figure 8 I have shown a resilient bridge piece 53 for engaging thecontacts 51 and 52 when the lever is raised and this bridgepiece isformed on the outer end of a strap 54 which is bolted to the arm orlever 10.

Changes in details may be made without departing from the spiritor scopeof this invention, but:

hat I claim as new is:

1. In a heat control device for furnaces, a single throw lever pivotallymounted at one end, means for raising and lowering'the lever from athermostat, a switch disposed in the path of the lever, means flexiblysupporting the switch, andv a draft door chain connected with saidlever.

2. In a heat controlling device for furnaces, a single throw leverpivotally mounted at one end, means for swinging the lever on and weightalso tends to insure proper engagement of the lever 26 with the rollerits pivot by a thermostat, a switch disposed in the path of the lever, apivoted arm supporting the switch, and means normally holding the switchin engagement with the lever.

8. In a heat control device for furnaces, a single throw lever pivotallymounted at one end, a toggle supporting the lever, means for operatingthe toggle from a thermostat, a switch disposed in the path of thelever, a pivoted arm supporting the switch, and means normally urgingthe arm in one direction for holding the switch in engagement with thelever, and a flexible draft door chain, connected with said lever.

4:. In a heat controlling device for furnaces, a single throw leverpivotally mounted at one end, means for swinging the lever from athermostat, a depending pivotally supported arm, a knife switch carriedby the arm including a pivoted foot lever, and a contact post, springmeans normally holding the switch lever from out of engagement with thepost, the foot lever being arranged in the path-of the lever, and meansnormally urging the arm in one direction for holding the switch incorrect position relative to the arm.

5. A heat control device for furnaces comprising a throw lever pivotallymounted at one end, a toggle lever connection, means for operating thetoggle lever connection from a thermostat for swinging the throw lever,a depending bracket, an arm pivoted to the bracket and dependingtherefrom, a stop arranged in the path of the arm, a switch carried bythe arm and arranged in the path of the throw lever, a weight and pulleyconnection for said arm normally urging the same toward said lever, andspring means normally urging the arm toward the lever.

6. In a heat control device for furnaces, a single throw lever embodyinga switch operating roller, means for adjusting the roller longitudinallyof the lever, a flexible draft door chain connected with the lever andmeans for adjusting the chain longitudinally of the lever.

In testimony whereof I afiix my signature.

ELMER E. GODDINGTON;

